You could get a chevy emblem like what's on the 70's truck grill and then put that over the hole. It would cover it and still look kind of neat. Another one might be find an old automotive looking clock face and put a modern battery quartz movement in there. Mount that over the hole.

\'59 Chevy 1-ton
'72 c-10 (in progress)
The Great Rust(less) Mountain
\'47 Jeep cj2a